Finding the Fourth Proportional to 1,427.58, 1,970.03 and 789.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,427.58 : 1,970.03 = 789.50 : x
2. Step 2: Convert to fraction form
   1,427.58/1,970.03 = 789.50/x
3. Step 3: Cross multiply
   1,427.58x = 1,970.03 × 789.50
4. Step 4: Simplify right side
   1,427.58x = 1,555,345.58
5. Step 5: Solve for x
   x = 1,555,345.58/1,427.58
6. Step 6: Final answer
   x = 1,089.50